Papua New Guinea's export revenue is reported to have declined for the first time in five years.Treasurer Patrick Pruaitch has revealed this on the eve of the P-N-G Leaders' Summit tomorrow.The decline is due to the huge fall in crude oil prices in recent weeks.He says the fall will affect projected export earnings from the P-N-G L-N-G and affect government revenues.Most analysts are anticipating the crude oil prices will remain low at least for another 12 to 18 months, suggesting that peak prices of recent times may be a thing of the past.Treasurer Pruaitch says it's a challenging time for all levels of leadership in P-N-G, and the summit is timely for them to take stock and to address the new challenges facing the country's economy.He says PNG's economy is at a crossroads with export revenues starting to flow from the 19-billion-US-Dollar or 50-billion-Kina PNG LNG project.Pruaitch says the lower crude oil and mineral prices would place a strain on the 2015 budget, and lead to some tightening in fiscal conditions.He urged leaders to ensure record levels of spending planned for this year are utilized with the aim of creating maximum impact without wasteful expenditures.Minister Pruaitch urged the heads of all government departments to take full responsibility for projects they are undertaking and to ensure there are adequate controls in place on all expenditures so that cost are avoided.The Treasurer is expected to make a statement on the state of the economy at the Leaders' Summit tomorrow.